Exhibit 4.4

NUMBER

ATRC AtriCure SHARES

ATRICURE, INC.

INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE

SEE REVERSE FOR CERTAIN DEFINITIONS

THIS IS TO CERTIFY THAT

CUSIP 04963C 20 9

is the owner of

FULLY PAID AND NON-ASSESSABLE SHARES OF THE COMMON STOCK OF THE PAR VALUE OF $0.001 PER SHARE OF

ATRICURE, INC.

transferable upon the books of the Corporation by the holder hereof in person or by duly authorized attorney upon surrender of this Certificate properly endorsed. This certificate is not valid unless countersigned by the Transfer Agent and registered by the Registrar.

Witness the facsimile seal of the Corporation and the facsimile signatures of its duly authorized officers.

Dated:

(ILLEGIBLE)

SECRETARY

ATRICURE, INC.

CORPORATE SEAL 2000 DELAWARE

DAVID D(ILLEGIBLE)

PRESIDENT

COUNTERSIGNED AND REGISTERED:

AMERICAN STOCK TRANSFER & TRUST COMPANY

(NEW YORK)

TRANSFER AGENT AND REGISTRAR

BY

AUTHORIZED SIGNATURE

The Corporation will furnish without charge to each stockholder who so requests a statement of the designations, relative rights, preferences, and limitations applicable to each class of shares and the variations in rights, preferences, and limitations determined for each series thereof (and the authority of the Board of Directors to determine variations for future series). Such request may he addressed to the Secretary of the Corporation or to the Transfer Agent and Registrar named on the face of this Certificate.

The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws or regulations:

TEN COM — as tenants in common

TEN ENT — as tenants by the entireties

JT TEN — as joint tenants with right of survivorship and not as tenants in common

UNIF GIFT MIN ACT—              Custodian             

(Cust) (Minor) under Uniform Gifts to Minors

Act             

(State)

Additional abbreviations may also be used though not in the above list.

For value received,              hereby sell, assign and transfer unto

PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER OF ASSIGNEE

(PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)

Shares of the capital stock represented by the within Certificate and do hereby irrevocably constitute and appoint              Attorney to transfer the said stock on the books of the within named Corporation with full power of substitution in the premises.

Dated             

NOTICE: THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME AS WRITTEN UPON THE FACE OF THE CERTIFICATE IN EVERY PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATEVER.

Signature(s) Guaranteed:

THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM), PURSUANT TO S.E.C. RULE 17Ad-15.